Pump device



7, 1968 YU A'KA YOSHIKAWA 3,398,687

PUMP DEVICE Original Filed March 31, 1964 2 Sheets-Sheet 1 BY 8 M SW ATTORNEY- 7, 1968 YUTAKA YOSHIKAWA 3,398,687

PUMP DEVICE 2 Sheets-Sheet 2 Original Filed March 31, 1964 Fey- INVENTOR: 71/ 7A /\A yaw/m h/A BY 2M. M

ATTORNEY.

United States Patent 3,398,687 PUMP DEVICE Yntaka Yoshikawa, 24 2-chome, Hatsudai, Shibuya-ku, Tokyo, Japan Continuation of application Ser. No. 570,377, Aug. 4, 1966, which is a continuation of application Ser. No. 356,145, Mar. 31, 1964. This application June 1, 1967, Ser. No. 642,973

Claims priority, application Japan, Apr. 6, 1963, 38/18,434 2 Claims. (Cl. 103-5) This application is a continuation of applicants Ser. No. 570,377, filed Aug. 4, 1966, which is a continuation of applicants Ser. No. 356,145, filed Mar. 31, 1964, both now abandoned.

The present invention relates to a submersible electric water pump.

An object of this invention is to provide a pump comprising a submersible electric motor and a frusto-conical impeller. The invention will be better understood from the following description with reference to the accompanying drawings, in which:

FIG. 1 is a side elevational view partly shown in vertical section illustrating a pump embodying the invention.

FIG. 2 is a side elevational view in axial section illustrating an auxiliary pump unit for use with the pump shown in FIG. 1.

FIG. 3 is a view similar to FIG. 2 illustrating a modified form of auxiliary pump unit.

FIG. 4 is a side elevational view, on a reduced scale, showing a pump according to FIG. 1 assembled with an auxiliary pump unit according to FIG. 2 or FIG. 3.

Referring to FIG. 1, the pump comprises an outer housing consisting of a lower member 1 threadedly secured to an upper member 2. An alternating current induction motor 3a is enclosed within a watertight inner housing 3. The inner housing 3 is rigidly connected to the lower housing member 1 of the outer housing 1, 2 by circularly spaced guide vanes 4 which are shaped to permit the free upward flow of water between the inner housing 3 and the outer housing 1, 2 from the inlet 1a at the bottom of housing member 1 to the outlet 2a at the top of housing member 2. The inlet 1a and outlet 2a, as shown, are axially aligned tubular extensions of housing members 1 and 2, respectively. The motor 3 is provided with a vertically extending output shaft 5- in axial alignment with the inlet 1a and outlet 2a which carries a generally frusto-conically shaped impeller 6 at its lower end. The impeller 6 is located in a complementary generally frusto-conically shaped bottom portion of the lower housing member 1 with its blades 6a spaced radially outwardly of the inlet In. Current for the energization of the induction motor 3a is supplied by a three-conductor flexible cable 7 which enters the upper housing member 2 through a watertight bushing 7a.

At the lower end of the lower housing member 1, the inlet 1a is provided with a strainer 8 secured by an interiorly threaded clamping collar 8a. At its upper end, the outlet 2a is provided with an interiorly threaded hose connection cap 9 for a discharge hose (not shown). At the bottom of the lower housing member 1, radially extending apertured cars 10 are indicated in dotted outline. The ears 10 are provided, if desired, for the connection of supporting means such as rope, cables, chains or the like.

In operation, the frusto-conical impeller creates a water flow which is upwardly and outwardly divergent from the strainer 8 toward the upper housing member 2. The frusto-conical shape of the impeller 6 reduces the power out-put which is required from the shaft 5 of the "Ice motor 3 as compared with the usual fiat impeller. A pump of improved efiiciency is thus obtained.

Referring to FIG. 2, the auxiliary pump unit comprises an outer housing consisting of a lower member 11 connected to an upper member .12. The outer housing 11, 12 is suitably connected to and spaced from an inner housing consisting of a lower member 13 connected to an upper member 14. The lower member 11 is arranged to be connected to the top of the upper housing member 2 of FIG. 1 instead of the hose connection cap 9, as illustrated in FIG. 4, the hose connection cap 9 being placed on top of the upper housing member 12. A vertical shaft 15 is journaled in the inner housing 13, 14. The motor shaft 5 shown in FIG. 1 is extended upwardly and provided with a transverse tongue 5a so that it may be drivingly connected to the lower end of the shaft 15 by engagement in a transverse slot 15a as shown in FIG. 2. Adjacent to the bottom of the inner lower housing member 13, a frusto-conical impeller 16 is fixedly connected to the vertical shaft 15 to be driven thereby 'so that the impellers 6 and 16 rotate in unison. The impeller 16 operates as described above for the impeller 6 of FIG.1.

The vertical shaft 15 extends completely through the inner housing 13, 14 and its upper end is provided with a tongue 15b arranged for connection to the lower end of the corresponding shaft of a further auxiliary pump unit of the same construction at that shown in FIG. 2, when required, the further unit being mounted on top of the first unit with its -shaft 15 in axial alignment with the shaft of the lower unit and drivingly connected thereto. The inner housing 13, 14 may be utilized, if desired, for the enclosure of a power supply such as dry cells 17. In the case of a miniature pump, the induction motor 3 of FIG. 1 may be replaced by a battery operated motor energized by the dry cells 17 via a conductor 17a passing through watertight bushings 17b.

In FIG. 3, the shaft 18 terminates in a bearing 18a in the lower inner housing portion 13 and is not upwardly extended as in FIG. 2. The slot 15a is arranged to receive the tongue 5a as shown in FIG. 2.

While I have shown and described what I believe to be the best embodiment of my invention, it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

What is claimed is:

1. A submersible water pump comprising a first outer housing having an outlet at its top and an inlet at its bottom; a second outer housing having an outlet at its top and an inlet at its bottom connected directly to said outlet of said first housing in axial alignment therewith; a first water-tight inner housing enclosed within said first outer housing; a second water-tight inner housing enclosed within said second outer housing; guide vane means rigidly connecting each inner housing to its associated outer housing in spaced relationship, said guide vane means being shaped to permit the free flow of water from the inlet to the outlet of each of said outer housings around the outside of each inner housing, the inside of said first outer housing being shaped at its bottom portion to provide an upwardly and outwardly divergent generally frusto-conical recess; an axially fixed generally frustoconically shaped impeller freely revolvably disposed in said frusto-conical recess, the blades of said impeller being spaced radially outwardly of its associated inlet; vertical drive shaft means extending through at least one of said inner housings; an electric motor disposed in said one of said inner housings, the rotor shaft of said motor being included in said drive shaft means, said motor being cooled by the fiow of water around the inner housing in r e 3 which -it is "disposed; and a other of said inner housings; said battery being connected to energize said motor.

2. A pump according to claim 1, wherein said drive shaft means extends through both of said housings; in which said motor is disposed in the lower one of'said inner housings, said battery being disposed in the upper one of said inner housings; and in which the upper and lower end 'portions of said drive shaft means are shaped "for coupling engagement with an end portion of -drive shaft means of a further pump in accordance with claim '1, when the drive shaft means of both pumps are placed in axial alignment with'each other.

battery disposed within the UNITED STALFES PATENTS Hollander 1035 Replogle 230-117 Walsh et al 10388 Bartels 10387 

1. A SUBMERSIBLE WATER PUMP COMPRISING A FIRST OUTER HOUSING HAVING AN OUTLET AT ITS TOP AND AN INLET AT ITS BOTTOM; A SECOND OUTER HOUSING HAVING AN OUTLET AT ITS TOP AND AN INLET AT ITS BOTTOM CONNECTED DIRECTLY TO SAID OUTLET OF SAID FIRST HOUSING IN AXIAL ALIGNMENT THEREWITH; A FIRST WATER-TIGHT INNER HOUSING ENCLOSED WITHIN SAID FIRST OUTER HOUSING; A SECOND WATER-TIGHT INNER HOUSING ENCLOSED WITHIN SAID SECOND OUTER HOUSING; GUIDE VANE MEANS RIGIDLY CONNECTING EACH INNER HOUSING TO ITS ASSOCIATED OUTER HOUSING IN SPACED RELATIONSHIP, SAID GUIDE VANE MEANS BEING SHAPED TO PERMIT THE FREE FLOW OF WATER FROM THE INLET TO THE OUTLET OF EACH OF SAID OUTER HOUSINGS AROUND THE OUTSIDE OF EACH INNER HOUSING, THE INSIDE OF SAID FIRST OUTER HOUSING BEING SHAPED AT ITS BOTTOM PORTION TO PROVIDE AN UPWARDLY AND OUTWARDLY DIVERGENT GENERALLY FRUSTO-CONICAL RECESS; AN AXIALLY FIXED GENERALLY FRUSTOCONICALLY SHAPED IMPELLER FREELY REVOLVABLY DISPOSED IN SAID FRUSTO-CONICAL RECESS, THE BLADES OF SAID IMPELLER BEING SPACED RADIALLY OUTWARDLY OF ITS ASSOCIATED INLET; VERTICAL DRIVE SHAFT MEANS EXTENDING THROUGH AT LEAST ONE OF SAID INNER HOUSINGS; AN ELECTRIC MOTOR DISPOSED IN SAID ONE OF SAID INNER HOUSINGS, THE ROTOR SHAFT OF SAID MOTOR BEING INCLUDED IN SAID DRIVE SHAFT MEANS, SAID MOTOR BEING COOLED BY THE FLOW OF WATER AROUND THE INNER HOUSING IN WHICH IT IS DISPOSED; A BATTERY DISPOSED WITHIN THE OTHER OF SAID INNER HOUSINGS, SAID BATTERY BEING CONNECTED TO ENERGIZE SAID MOTOR. 